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Hoppe's No.9 Elite Copper Terminator quickly dissolves welded copper fouling from bore steel without the use of ammonia. Can be used alone or as a powerful systems approach with Hoppe's Elite Gun Cleaner by removing layers of carbon build-up, allowing for more rapid copper etching. It is odorless, ammonia-free, non-toxic, non-flammable, and doesn't leave ammonia-type crystals that can attract water, causing corrosion and microscopic stress fractures.